Gah!
A tip: don’t accidentally hit reply or try to go back to a previous page or anything like that. Some overzealous coder has made it so that doing so will automatically submit the entire test for you, and you’ll end up having to close the entire tab/window to try again.
First score was therefore a staggering 8%!

Trying a second time now … Second try, 98%. (Actually, only 96%, but two of the wrong answers were just my eyes missing the lack of a lenition and not looking through all the options properly …)
It gave me a wrong for one of the answers, though, where you can easily argue that two of the options are equally correct. Quadruple genitives, wouldn’t you know it.
Stiúrthóir Ionad T(h)eangacha Dúchasacha Alasca can be right both with and without the lenition, depending on whether we’re talking about the director of the Alaska Centre for Native Languages or the director of the Centre for Native Alaska(n) Languages. It only wanted one of them to be correct, though. (Can’t remember which one, closed the tab now)